Camera Flash Power Adjustment via Face Detection
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Solution Overview
Problem
Existing electronic devices with camera capabilities face challenges in accurately adjusting the photographic lamp for flash compensation, particularly when capturing images with human faces, as the current methods often result in over- or under-flashing, failing to meet user requirements.
Innovation Solution
An adjusting system within the electronic device that includes a light sensor and processor-controlled modules to determine if a human face is present in the image and adjust the photographic lamp's output power based on ambient brightness values, using pre-defined reference tables to optimize flash compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the photographic lamp uses fixed output power for flash compensation, then the device structure is simple, but the flash compensation accuracy deteriorates resulting in over-flashing or under-flashing
Solution Approach 1:
The patent applies dynamics by transitioning from fixed output power to dynamically adjustable output power for the photographic lamp. The adjusting system dynamically modifies the lamp's output based on detected ambient brightness levels and face detection results, enabling adaptive flash compensation that accurately responds to varying shooting conditions while maintaining reasonable system complexity through processor-controlled adjustment.
Solution Approach 2:
The patent implements feedback by using a light sensor to detect ambient brightness and a processor to analyze whether a face is present in the scene. This feedback information is then used by the adjusting system to automatically modify the photographic lamp's output power, creating a closed-loop control system that improves flash compensation accuracy without requiring manual intervention.
2Use of energy by moving object
If the photographic lamp output is increased to ensure sufficient flash compensation, then the flash coverage is improved, but the image quality deteriorates due to over-flashing
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the output power parameter of the photographic lamp based on ambient brightness conditions and face detection results. Instead of using fixed high output energy, the system modifies the power parameter in real-time to match shooting conditions, ensuring sufficient flash compensation while preventing over-flashing that would degrade image quality.
3Manufacturing precision
If the photographic lamp output is decreased to avoid over-flashing, then the image quality is preserved, but the flash compensation effectiveness deteriorates
Solution Approach 1:
The patent resolves this contradiction through dynamic adjustment of the photographic lamp's output power. The system continuously adapts the power level based on real-time conditions: using higher output when ambient light is low or faces are detected, and reducing output when ambient light is sufficient. This dynamic behavior ensures both image quality preservation and reliable flash compensation effectiveness across varying conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively adjusts the photographic lamp's power to ensure proper flash compensation, enhancing the quality of captured images by matching the flash output to the ambient conditions and presence of a human face, thereby improving image capture accuracy.
Implementation Method 1
obtain a brightness value of ambient light
Data Source
AI summary
In a method for adjusting a photographic lamp of an electronic device, the electronic device obtains a preview image from a camera device of the electronic device, and obtains a brightness value of an ambient environment of the electronic device. When a human face is detected in the obtained preview image, the electronic device changes a current output power value of the photographic lamp to be a first output power value, according to the obtained brightness value. When no human face is detected in the obtained preview image, the electronic device changes the current output power value to be a second output power value according to the obtained brightness value.